Watch LCD Polarizer Alignment for Floating Display Windows
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Solution Overview
Problem
Existing liquid crystal display devices for timepieces suffer from misalignment issues between polarizers, leading to visible offsets and a low-end appearance due to polarizers with dimensions smaller than the visible window, resulting in a silvery crescent effect.
Innovation Solution
A method for precisely aligning and positioning polarizers in liquid crystal cells, ensuring they partially cover the visible zone and are accurately positioned relative to electrodes, using a series of targets and alignment marks to achieve perfect alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If polarisers are made with dimensions smaller than the visible window to create a floating display zone, then the aesthetic quality of the display is improved, but alignment precision deteriorates due to visible offsets and silvery crescent effects
Solution Approach 1:
The patent applies preliminary action by creating alignment marks and targets on the substrates before assembling the liquid crystal cell. These marks serve as guides that enable precise positioning of the polarisers during assembly, preventing misalignment issues that would otherwise occur with reduced polariser dimensions.
Solution Approach 2:
The patent introduces alignment marks and targets as intermediary elements that facilitate the precise positioning of polarisers. These intermediaries bridge the gap between the reduced polariser dimensions and the required alignment precision, allowing the polarisers to be accurately positioned relative to each other and to the electrodes.
2Shape
If polarisers are positioned to partially cover the visible zone for a floating display effect, then the visual appearance is enhanced, but positioning accuracy becomes more difficult to achieve
Solution Approach 1:
Alignment marks and targets are prepared in advance on the substrates, enabling precise measurement and positioning of polarisers during assembly. This preliminary preparation ensures that even though polarisers only partially cover the visible zone, they can be positioned with high accuracy relative to the electrodes and each other.
Solution Approach 2:
The patent utilizes optical targets that can be detected through color or optical property changes, enabling precise measurement and alignment of polarisers. These targets provide visual or optical feedback that facilitates accurate positioning during the assembly process.
Data Source
AI summary
A method for manufacturing a liquid crystal cell (LCD cell), forming a horology display device, includes the formation of a base assembly (32), including the two transparent plates on which the electrodes (28, 29) are structured, and a cover assembly (66) including a useful part (50) formed by a polariser and a layer of glue for fastening the polariser to one of the transparent plates. To deposit the polariser precisely, targets (30a, 30c) are made in the base assembly and corresponding alignment marks (48a, 48c) are blanked in at least one working part of the cover assembly, such that the targets can be seen through the alignment marks when the cover assembly is placed on the base assembly when the polariser is glued to this base assembly.